Engineering Commons^™

Modification Of Lithium Lubricants, Azimova Shodiyakhon, Arslanov Sharafutdin, Aripdjanov Oybek, Azimov Dilmurod

CHEMISTRY AND CHEMICAL ENGINEERING

The aim is to study the effect of the presence of free alkalis and acids on the properties of the complex lithium greases and the choice of the optimal dispersion medium, which provides the required physicochemical characteristics of the developed grease. The dispersed phase of lithium greases studied in the polyalphaolefin oils media. It was found that the use of a mixture of polyalphaolefin oil-4 and polyalphaolefin oil-40 as a percentage of 23/77 with a total content of 83.0% provides a relatively low effective viscosity of the lubricant at low temperatures and a relatively high tensile strength at high temperature.

Effective Oil Extraction From Bombyx Mori Silkworm Pupae And Its Structural Characteristics, Avazova Oynavod, Yugai Sveta, Rashidova Sayora

CHEMISTRY AND CHEMICAL ENGINEERING

The conditions for the effective isolation of oil from the silkworm Bombyx mori pupae, based on the extraction of extracted oil with organic reagents, have been studied. The quantitative content of oil was determined in the samples. It is revealed that the oils extracted using gasoline have a high fat-wax composition compared with ethyl alcohol and hexane. When dried pupae processed with gasoline, it is possible to extract up to 16% of fatty substances as much as possible. Physical-chemical characteristics of the oil from silkworm pupae are characterized by high quality indicators. In particular, the presence of unsaturated fatty acids …

Composition Of Liquid Paraffins For Flotation Enrichment Of Potassium Chloride, Vaqqosov Sobir, Xolmuratov Shamsitdin, Buxarov Shuhrat, Kodirov Orifjon

CHEMISTRY AND CHEMICAL ENGINEERING

The purpose of this work is to determine the source of liquid paraffins from secondary products of the local chemical industry, compare the performance properties and use the resulting products as apolar co-reagents in silvinite flotation. The experiments were conducted with secondary used hexane and pyrocondensation. To improve the efficiency of flotation, the dependences of the order of reagent’s supply into the process and the time of action were studied. Experiments have shown that when adding tetradecane and pentadecane in an amount of 2.5 to 7.5% to hexane liquid paraffins, it is possible to reduce the tail of KCl to …

Influence Of Technological Parameters On The Chemical Composition Of Calcium Polyphosphates From Phosphorites Central Kyzylkum, Ulugberdieva Ziyada, Khujamberdiev Sherzod, Mirzakulov Kholtura, Usmanov Ilkham

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the research was to study the effect of temperature, the ratio of P2O5EPA:P2O5PRM and the duration of calcination on the content of various forms of P2O5 in calcium polyphosphate. The effect of calcination temperature from 150 to 300 °C, the ratio of P2O5EPA:P2O5FRM from 2,15 to 4,50 and the duration of the process from 20 to 120 minutes on the changes in various forms of P2O5 were studied. It was shown that with increasing temperature to 200-250 °C the content of the total (ortho + poly) assimilable form of Р2О5 increases and then decreases, passing through a …

Bases Of Development Of Technologies Of Synthesis Of Oxide Materials In Big Solar Furnace (Parkent), Gulamova Dilbara, Baxronov Khayot, Bobokhulov Sirojiddin, Eshonkulov Elyor

CHEMISTRY AND CHEMICAL ENGINEERING

The advantages of synthesis of complex oxide compounds by solar energy, the possibility of obtaining highly textured nano materials are shown. The development of heliomaterial science, aimed at the synthesis of new materials, is inextricably linked with the use of effective optical energy systems. On the example of obtaining superconducting materials of nominal composition Bi1.7Pb0.3Sr2Ca(n-1)CunOy (n = 3-20), optimization of the parameters of the optical-energy system of the Big Solar Furnace (Parkent) is shown. The ideology of developing heliotechnology for the synthesis of inorganic materials in a solar furnace is presented. The properties of a superconducting material of nominal Bi1.7Pb0.3Sr2Ca(n1)CunOy …

Sustainability Action Tracker, Gladys Hilerio, Isabelle Termaat, Patricia Ornelas Jauregui

Computer Science and Engineering Senior Theses

The Center for Sustainability at Santa Clara University is actively looking for ways to involve students in sustainable actions and accountability. With our help, they would like to create a site where students and faculty may track their sustainable behavior. This site will provide users with all the information they need to live a sustainable life, and include milestones in the form of progress bars and badges. The Center for Sustainability will be able to collect the data from this site to evaluate the progress of our university as well as the success of the site. Our motivation for this …

Small Molecule Drug Release Form In Situ Forming Degradable Scaffolds Incorporating Hydrogels And Bioceramic Microparticles, David A. Puleo, Todd A. Milbrandt, J. Zach Hilt, Paul Fisher, Vishwas Talwalkar

Biomedical Engineering Faculty Patents

The present invention relates to an injectable system combining a hydrogel, a bioceramic and a degradable matrix that provides for sustained drug delivery and structural support to recovering tissue, such as bone and the periodontium.

A Systems-Level Approach To The Design, Evaluation, And Optimization Of Electrified Transportation Networks Using Agent-Based Modeling, Landon Clark Willey

Theses and Dissertations

Rising concerns related to the effects of traffic congestion have led to the search for alternative transportation solutions. Advances in battery technology have resulted in an increase of electric vehicles (EVs), which serve to reduce the impact of many of the negative consequences of congestion, including pollution and the cost of wasted fuel. Furthermore, the energy-efficiency and quiet operation of electric motors have made feasible concepts such as Urban Air Mobility (UAM), in which electric aircraft transport passengers in dense urban areas prone to severe traffic slowdowns. Electrified transportation may be the solution needed to combat urban gridlock, but many …

Usu Engineering Professor Named Ieee Distinguished Lecturer, Usu College Of Engineering

College of Engineering News

June 16, 2020 — Utah State University Professor Rose Hu has again been named to a class of distinguished lecturers within the Institute of Electrical and Electronics Engineers, known as IEEE.

Study And Characterization Of Conductive Elastomers For Biomedical Applications, Hadis Gharacheh

Theses and Dissertations

Health issues have always been one of humankind's biggest challenges. Over the last century, there has been significant and monumental progress in health and biomedical science, with the end goal of alleviating and eliminating illnesses and ailments. For developing biomedical devices, polymers and elastomers group among other types of biomaterials have been highlighted to be used due to high flexibility, stability, biocompatibility, and mechanical and rheological characteristics. In this work, the characterization of acrylated poly glycerol_sebacate (PGSA) polymer conjugated with bio ionic liquid (BIL) was investigated. Results showed high biocompatibility, high printability with tunable mechanical, adhesive, and conductivity properties. For …

Electrospun Nanofibrous Membrane Based Glucose Sensor With Integration Of Potentiostat Circuit, Kavyashree Puttananjegowda

USF Tampa Graduate Theses and Dissertations

Although wearable and portable biomedical devices are the pillar of modern and smart societies, a large portion the device infrastructure is still under development, operates with poor monitoring and automation, and lacks sufficient communication among components. Moreover, demand for wearable bio-medical devices is expected to increase in the coming years. This situation presents a unique opportunity for electrical engineers to design novel strategies that allow point-of-care diagnostics to satisfy the increasing demand of wearable bio-medical devices. For example, in the medical field there is a rising diabetic population base, high demand for miniature and low-power diagnostic devices, and the need …

Performance Of A Full-Scale Rammed Aggregate Pier Group In Silty Sand Based On Blast-Induced Liquefaction Testing In Emilia-Romagna, Italy, Paul Joseph Walsh Andersen

Theses and Dissertations

To investigate the liquefaction mitigation capability of Rammed Aggregate Piers® (RAP) in silty sand, blast liquefaction testing was performed at a soil profile treated with a full-scale RAP group relative to an untreated soil profile. The RAP group consisted of 16 piers in a 4x4 arrangement at 2 m center-to-center spacing extending to a depth of 9.5 m. Blasting around the untreated area induced liquefaction (ru ≈1.0) from 3 m to 11 m depth, producing several large sand boils, and causing settlement of 10 cm. In contrast, installation of the RAP group reduced excess pore water pressure (ru ≈0.75), eliminated …

Analysis Of Performance Measures Of Traffic Incident Management In Utah, Mitchell Gregory Hadfield

Theses and Dissertations

In 2009 the Federal Highway Administration published a report regarding a Focus States Initiative that had been conducted with 11 states to discuss the development of national Traffic Incident Management (TIM) standards. Performance measures were defined, and a national TIM dashboard created, but very little data has been added to the dashboard since. In this research study, performance measures of the Utah Department of Transportation (UDOT) TIM program were analyzed. Data availability was first assessed to determine whether these performance measures could be calculated. It was determined that crash response data available from the Utah Highway Patrol (UHP) could be …

Evaluating The Impacts Of Hurricane Maria On The Residential Construction Industry In Puerto Rico And The Effectiveness Of Reconstruction Efforts, M. Bradley Wells

Theses and Dissertations

In September of 2017, Hurricane Irma and Hurricane Maria, both category 5 hurricanes, swept across the Caribbean, including the U.S. Territory island of Puerto Rico. These two storms, particularly Hurricane Maria, caused catastrophic damages from high winds and flooding to the island paradise. This research investigates the direct effects that Hurricane Maria had on the residential construction industry within Puerto Rico and evaluates how to better prioritize and manage these types of efforts in the future. This research was initiated to identify challenges and opportunities that have been encountered within the Puerto Rican construction industry during the first year of …

In Vivo Biosynthesis Of Inorganic Nanomaterials Using Eukaryotes - A Review, Ashiqur Rahman, Julia Lin, Francisco E. Jaramillo, Dennis A. Bazylinski, Clayton Jeffryes, Si Amar Dahoumane

Life Sciences Faculty Research

Bionanotechnology, the use of biological resources to produce novel, valuable nanomaterials, has witnessed tremendous developments over the past two decades. This eco-friendly and sustainable approach enables the synthesis of numerous, diverse types of useful nanomaterials for many medical, commercial, and scientific applications. Countless reviews describing the biosynthesis of nanomaterials have been published. However, to the best of our knowledge, no review has been exclusively focused on the in vivo biosynthesis of inorganic nanomaterials. Therefore, the present review is dedicated to filling this gap by describing the many different facets of the in vivo biosynthesis of nanoparticles (NPs) using living eukaryotic …

Sdhome: Securing Fast Home Networks, Christopher Batula, Holden Gordon, Tianyi Zhao

Computer Science and Engineering Senior Theses

Distributed denial of service (DDoS) is a highly discussed network attack in Software Defined Networks. Attacks such as the Mirai Botnet threaten to compromise portion of large networks, including home users. Today, corporations secure their network using enterprise level software to protest their network from DDoS attacks . But their solutions are meant for large networks and depend on expensive hardware. There are few security solutions for home users and most are expensive or require a subscription for full protection. In this paper, we propose a new solution in the form of a plug and play device that will allow …

Nonlinear Breaking-Wave Characteristics In Lagrangian Coordinates, Wen-Jer Tseng, Chia-Yan Cheng

Journal of Marine Science and Technology–Taiwan

This paper presents a theoretical investigation of nonlinear surface-wave propagation over a sloping bottom. For a problem with nonlinear surface-wave propagation over a sloping bottom, a perturbation method is first used to find the analytical solution in order to derive the third order terms for the bottom slope  and the wave steepness  in the Eulerian system. Then, by transforming the flow field solution from the Eulerian system into the Lagrangian system, a more accurate wave profile is identified. By using the kinematic stability parameter, new theoretical breaking-wave characteristics are derived. The theoretical solutions are then compared with those …

Share Buybacks And Income Inequality, Thomas Power

Articles

Should you care what companies do with their profits? Two U.S. democratic senators, Chuck Schumer and Bernie Sanders, in an article in the New York Times, argue that we should all care because what companies do with their profits can damage the economy and jobs.

Handling Missing Data For Unsupervised Learning With An Application On A Fitbir Traumatic Brain Injury (Tbi) Dataset, Louis Steinmeister, Dacosta Yeboah, Gayla Olbricht, Tayo Obafemi-Ajayi, Bassam Hadi, Daniel Hier, Donald C. Wunsch

Mathematics and Statistics Faculty Research & Creative Works

"The problem of missing data and imputation have been widely discussed amongst specialists. However, many data scientists and applied statisticians fail to appropriately consider this issue. Often, it seems intuitive to discard observations containing missing data or simply to substitute means. This can lead to disastrous consequences, particularly in an era of exponentially increasing data volumes. In the following, we show how inappropriate handling of missing data and an insufficient analysis of the censoring mechanism can lead to a bias, overconfidence in the estimation of parameters, could challenge the reproducibility of obtained results, and may distort the structure of the …

Channel Estimators For Full-Duplex Communication Using Orthogonal Pilot Sequences, Arul Mathi Maran Chandran, Lei Wang, Maciej Jan Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

Full-duplex communication is desirable to maximize the spectral efficiency, despite the challenges it puts forth. The key challenge inhibiting the operation of radios in full-duplex mode is self-interference. In this paper, we propose a pilot-based channel estimation to estimate both self-interference and communication channels simultaneously at both ends of a full-duplex link using orthogonal sequences. The Cramer-Rao Lower Bound for estimators of both the channels was determined and compared with the half-duplex channel estimator. We performed simulations varying sequence length and channel taps and studied the performance of the estimators. We also studied the effect of synchronization between the sequences …

Investigation Of The Process Of Self-Discharge Acid Batteries, Asilbek Kiryigitovich Mamatkulov, Eldor Ikromovich Ruzmatov, Gulniso Yulchievna Zhumaeva, Furkat Ilyasovich Erkabaev

Chemical Technology, Control and Management

In this study, investigations were conducted on the process of self-discharge of acidic car batteries. The dependence of battery discharge on environmental temperature has been studied. It was found that the self-discharge of batteries increases by up to 60% over 12 months when the temperature rises from +10⁰C to +40⁰С. Replacing the tin in the electrode alloy with a more electronegative metal has been shown to reduce the self-discharge process by up to 2% per month. Because, the self-discharge of electrode batteries made of lead-calcium alloy is relatively low, the consumption of working fluid is relatively …

Methods Of Organizing Energy-Closed Technology, Nadirbek Rustambekovich Yusupbekov, Shuxrat Manapovich Gulyamov, Yusuf Shodiyevich Avazov, Nasiba Djumabayevna Xodjiyeva

Chemical Technology, Control and Management

The classification of methods for analyzing energy-technological processes is conducted Promising methods are considered: exergetic, thermo econometric, thermal diagram method, information-thermodynamic method, and method based on the consideration of the irreversible process of heat transfer of an object to the environment. A comparative assessment of the considered methods is given and the expediency of their use is justified.

Mathematical Modeling Of Thermal Processes Of Traction Asynchronous Engines For Diagnosis And Control Of Their Technical Condition, Nilufar Rabbanaqulovna Avezova, Javharbek Sulton Ugli Fayzullayev

Chemical Technology, Control and Management

Mathematical models of thermal processes of traction asynchronous motors are developed. A traction asynchronous motor is considered as a thermal system consisting of three bodies (stator winding, stator magnetic core and rotor), which take into account the heat exchange not only between the corresponding bodies, but also the heat exchange between each body and the environment. It is shown that the steady excess of the stator winding temperature of a traction asynchronous motor depends on the multiplicity of the stator winding current, the coefficient of electrical energy loss, and also on the temperature coefficient of the resistance of the winding …

Theory, Fabrication, And Characterization Of Perovskite Phototransistor, Fatemeh Khorramshahi

USF Tampa Graduate Theses and Dissertations

In recent years, there has been a significant interest in making electronic devices with low-cost techniques and materials for both industrial and medical applications. Methylammonium lead iodide perovskite (MAPbI3) is one of the novel materials which has drawn much attention owing to its outstanding optical and electrical properties along with inexpensive, simple, and easy fabrication methods. In this work, the feasibility of using microfluidic device fabrication techniques on making a perovskite phototransistor has been studied. The fabrication method well addresses challenges such as lead toxicity and instability.

In the first step, mechanical micromachining and laser engraving were employed to make …

Assessment Of Dynamic Response Of Offshore Jacket Platforms Subjects To Random Waves, Xiaoshuang Han, Weiliang Qiao, Bo Zhou

Journal of Marine Science and Technology–Taiwan

This paper presents a simplified approach to analyze the dynamic response of offshore jacket platform based on Timoshenko beam theory. In the study, the jacket platform is simulated as a non-uniform cantilever beam structure subjects to random waves. The assessment of dynamic performance is based on the power spectral densities, variances and spectral moments due to wave spectrum. A combination of Pseudo-excitation and Ritz method is proposed and adopted, such as the dynamic characteristics of the jacket platform can be solved more efficiently without a need to examine the modes of vibration. The proposed analytical method also provides a more …

Remote Measurement Of Plant Biomass By Picosecond Laser Radiation, Abdushukur Abdugafurovich Mukhamedov, Abdirashid Saribaevich Rysbaev, Shamsiddin Norchaevich Ernazarov

Chemical Technology, Control and Management

A description is given of a high-speed optical recording system that uses a solid-state yttrium-aluminum garnet Nd3+ laser that generates a train of picosecond laser pulses. It is shown that by registering and temporarily scanning the secondary fluorescence radiation excited by a sequence of picosecond pulses, it is possible to remotely determine the biomass of plants based on a prematurely created bank of laboratory data.

International Higher Education Cooperation Under Conditions Of Fuzzy Terminology: Intellectual Mobility Vector, Ulugbek Vasikovich Mannanov, Igor Ivanovich Gancherenok

Chemical Technology, Control and Management

Terminology analysis of higher education internationalization process concerning joint educational programs is fulfilled. Fuzziness of used terminology is demonstrated. Joint higher education establishments development in the framework of fractal model is suggested as a strategic direction of higher education internationalization, enhancement of its quality and a concept of effective intellectual mobility.

Synergetic Control Of Nonlinear Dynamic Objects, Isomiddin Siddikov, Komil Usmanov, Noilakhon Yakubova

Chemical Technology, Control and Management

Considers the synthesis of effective control algorithms for a chemical reactor, which is the main one in the production of butyl alcohol. The method based on synergetic approach for transferring the apparatus from one capacity to another (specified) maintaining the required quality of the target component is proposed in order to ensure the stabilization of the concentration of target component at the outlet of the reactor under the conditions of uncertain disturbances affecting to an object. A mathematical model of the process based on a stoichiometric matrix taking into account the physicochemical properties of the process is developed. The control …

Research Properties Of Solving Problems Of Parametric Optimization, Dilnoz Tulkunovna Muhamediyeva

Chemical Technology, Control and Management

A model of parametric optimization with fuzzy initial information is constructed. The conditions and areas of application of the main methods of the theory of fuzzy sets in studies of parametric optimization are determined. A connection is established between the stability of parametric optimization problems and fuzzy optimization problems. An algorithm for solving problems by the method of parametric programming is developed for fuzzy given initial information. The admissible region of the parametric programming problem and the value of its objective function at each point of this region depend on the parameter t. A description of the method for solving …

Solar Photovoltaic Considerations For Operational And Warfighter Support Capabilities, Dylan Martin-Abood, Douglas Dudis, Torrey J. Wagner

Faculty Publications

This work highlights the fundamental mechanisms and historical perspective for military PV technology applications and addresses the operational considerations for effectively deploying PV technology. PV materials, structures and architectures have matured into competitive and readily available energy technologies based on their levelized cost of energy (LCOE). However, enhancing warfighting capabilities requires attention to systems considerations beyond cost per watt or LCOE. While PV is impractical for fighters and bombers as it can meet less than 1% of their power requirements, there are numerous areas that could benefit from the application of PV technology. For example, installing PV arrays on all …